[Webkit-unassigned] [Bug 217299] New: await expression breaks some surrounding expressions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217299

            Bug ID: 217299
           Summary: await expression breaks some surrounding expressions
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: thatcomputerguy0101 at gmail.com

The `await` operator is not treated like a standard operator, since it breaks whenever used in several expression contexts.

The following two constructs are both broken by this bug, and I expect a few more to be as well:
let {property} = await asyncFunction() // results in SyntaxError: Unexpected identifier 'asyncFunction'. Expected ';' after variable declaration.
const result = await asyncFunction() // results in SyntaxError: Unexpected token ';'. const declared variable 'result' must have an initializer.

I expect this happens because the await operator tries to take some sort of assignment shortcut. The `await` operator is supposed to be just another operator (that happens to take an undefined duration), so it shouldn't matter where it is used. In Chrome, both of the above will work without errors (when run in the appropriate context).

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